'salir' and 'saltar' are from Latin 'salire' and 'saltare'. In case anyone's interested, 'saltar' is an intensive form derived from Latin 'saltus', the past participle of 'salire', plus new verb endings. Another example is 'cantar' from 'cantare', originally an intensive form 'chant' from the past participle 'cantus' of Latin 'canere', "sing".
As a cultural note, I learned both "saltar" and "brinquear" (jump/leap) from one of my favorite Reggaeton songs, "Pide que Brinque" by Presagio. https://www.youtube.com/watch?v=76psx2pzocw&index=5&list=PL5BF6A26FC8E1C3E2
A problem I see with DuoLingo is that they give you an exercise based on a conjugated form of a verb ("salto") instead of the infinitive ("saltar"). In first person singular, you have no clue whether "salto" comes from an -ar or an -er verb, which means you cannot determine 2nd and 3rd person forms.
It has to be because they expect you to include an object (him, or it, or a noun), because this sentence stands alone. It's like if you were saying in English, "There is a log in front of me. I jump over [it]," the "it" is implied from context, because you've already named the object you jump over. So, with only a single sentence and no context, you have to say just "I jump."